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fixing two arg atan

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Alex Shinn 2012-05-07 00:21:00 +09:00
parent 99211de2b0
commit be7a80007b
1 changed files with 9 additions and 2 deletions
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11
lib/init-7.scm
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@ -1070,8 +1070,15 @@
(define magnitude abs)
(define (angle z) (if (< z 0) 3.141592653589793 0))))
(define (atan x . o)
(if (null? o) (atan1 x) (atan1 (/ x (exact->inexact (car o))))))
(define (atan y . o)
(if (null? o)
(atan1 y)
(let ((x (exact->inexact (car o))))
(if (negative? x)
(if (negative? y)
(- (atan1 (/ y x)) 3.141592653589793)
(- 3.141592653589793 (atan1 (/ y (- x)))))
(atan1 (/ y x))))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; string cursors